// Copyright (c) 2010-2014 SharpDX - Alexandre Mutel
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

using System.Collections.Generic;
using SharpDX.Direct3D11;

namespace SharpDX.Toolkit.Graphics
{
    internal struct InputLayoutPair
    {
        public InputLayoutPair(VertexInputLayout vertexInputLayout, InputLayout inputLayout)
        {
            VertexInputLayout = vertexInputLayout;
            InputLayout = inputLayout;
        }

        public readonly VertexInputLayout VertexInputLayout;

        public readonly InputLayout InputLayout;
    }

    internal class InputSignatureManager : Component
    {
        private readonly Direct3D11.Device device;

        public readonly byte[] Bytecode;

        private readonly Dictionary<VertexInputLayout, InputLayoutPair> Cache;

        public InputSignatureManager(GraphicsDevice device, byte[] byteCode)
        {
            this.device = device;
            Bytecode = byteCode;
            Cache = new Dictionary<VertexInputLayout, InputLayoutPair>();
        }

        public void GetOrCreate(VertexInputLayout layout, out InputLayoutPair currentPassPreviousPair)
        {
            lock (Cache)
            {
                if (!Cache.TryGetValue(layout, out currentPassPreviousPair))
                {

                    currentPassPreviousPair = new InputLayoutPair(layout, ToDispose(new InputLayout(device, Bytecode, layout.InputElements)));
                    Cache.Add(layout, currentPassPreviousPair);
                }
            }
        }
    }
}